An anti-counterfeit halftone intelligent digital watermark making method of paper medium output

Abstract

The invention discloses an anti-counterfeit halftone intelligent digital watermark making method of paper medium output. The specific steps are as follows: the host image is binarized, at the same time, the embedded watermark image is binarized, forming a binary digit string, and as the embeddable watermark coding information, a series of two-dimensional random number pairs are generated by usingthe random number seed as the key. The watermark coding information formed in S1 is embedded into the selected embedding position as the embedding position of the embeddable watermark coding information, and the host image embedding the watermark coding information is optimized by using the visual iterative algorithm. The trained neural network model is used to extract the watermark image. The invention can produce printing watermark with anti-counterfeiting function, has wide application prospect in copyright identification, anti-counterfeiting packaging and intelligent packaging, has high technical content, has large printing watermark embedding quantity, does not obviously affect image perception quality, and has hiding property and does not affect consumers to use printed matter.

Description

technical field [0001] The invention relates to a method for making a digital watermark, in particular to a method for making an anti-counterfeiting halftone intelligent digital watermark output by paper media. Background technique [0002] Digital watermarking technology can effectively improve the anti-infringement ability of digital media information. At present, packaging and printing anti-counterfeiting products based on digital watermarking technology are still rare in the market. The reason is that the imaging mechanism of printed images and digital images is fundamentally different. The printed matter reproduces the tone levels and color changes of the continuous tone original with a halftone dot distribution. During the printing process of continuous digital images, screening and color separation are firstly performed. The original embedded digital watermark is greatly damaged in this process, and after scanning and re-sampling and quantization, it is basically imp...

AI Technical Summary

Problems solved by technology

[0005]In the link of watermark detection, the existing detection algorithm is a reverse operation process, which introduces a formulaic printing-scanning conversion function, and deduces it in the screening process through calculation Embedded watermark information, because the formulaic printing and scanning models cannot include the complex conditions and random accidental factors in the actual production process, so the transformation of the screen mode cannot be correctly estimated, and generally a large deviation will occur

The actual detection effect of watermark is not ideal

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